Kyren Legate 
Creature — Goblin
$0.29 #28123 0.27 27.0 years
If an opponent controls a Plains and you control a Mountain, you may cast this spell without paying its mana cost.
Haste
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Cards similar to Kyren Legate expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Massacre87%
$0.37↑#11702↑0.17↓26.7 years
"If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost."
Anger84%
$0.37↑#346↑0.41↑24.4 years↓
"Haste"
Mogg Salvage78%
$0.28↓#6695↑0.11↓26.7 years
"If an opponent controls an Island and you control a Mountain, you may cast this spell without paying its mana cost."
Mogg Alarm70%
$0.23↓#19224↑0.00↓26.7 years
"You may sacrifice two Mountains rather than pay this spell's mana cost."